If you place a torch in water, normally it attaches briefly then breaks and the space is refilled with water. This is still the case, unless there is a block directly above the torch. Then the torch attaches to the wall and the space around it fills with air. If you break the torch the air remains.
[media]Edit: Now that I think about it, this is probably related to MC-128690.
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Wouldn't you say this is covered in your other ticket, MC-128690?

Yeah, it's probably the same issue. I had forgotten about the water issue until after I posted it.
If this still happens after MC-128690 is fixed, leave a comment and we can open it back up! 🙂

This is still happening in 1.13-pre5 even though it appears that MC-128690 has been fixed.

Still happening into 1.13-pre6. Can someone please open this back up? Thanks!